// Extend.js (http://code.google.com/p/extendjs/)
// Copyright 2010 Shumpei Shiraishi All rights reserved.
// Licensed under the MIT license.

(function(_global) {
    // null
    X.extend("Null", function(value) {
	return value === null;
    });
    X.Null.extend({
	isNull: function() {
	    return true;
	},
	isEmpty: function() {
	    return true;
	},
	toString: function() {
	    return "null";
	}
    }, true);
})(this);
